S&S, M8 107" to 124" big bore piston kit. STD

Compression ratio 11.1:1. The piston kit includes forged pistons, rings, wrist pins and locks. The crankcases require no machining. 4.250" big bore cylinders are required, OEM cylinders cannot be machined to 4.250". The 107" to 124" pistons come with a 1.143" deck height and are compatible with the OEM 107" 4.375" stroke crankshaft.
Note: For 4.250" big bore cylinders, see only S&S 574121 (rough black finish) or 547122 (rough black finish with highlighted fins).
Note: Gaskets are sold separately as head gaskets 591055, base gaskets 591054 or head and base gasket kit 591056.
Note: S&S recommends an S&S 550 series cam, available with either chain or gear drive.
Note: In all applications, the technician must be able to assess the suitability of the components in combination with the other engine components before installation. It is important that a qualified mechanic installs and carries out the necessary adjustments. The rider must follow standard running-in and riding procedures for rebuilt engines.


Specifications


Brand
S&S


Application
18-24 107" Softail; 17-24 107" FLT/Touring (NU)


Sales unit
Kit


Material
Steel


Packaging weight
1.459 kg


HS Code
84099100


Motorcycle family
SOFTAIL, TOURING


Original name
S&S, M8 107" to 124" big bore piston kit. STD